function replaceText(el, text) {
	if (el != null) {
		clearText(el);
		var newNode = document.createTextNode(text);
		el.appendChild(newNode);
	}
}

function clearText(el) {
	if (el != null) {
		if (el.childNodes) {
			for (var i = 0; i < el.childNodes.length; i++) {
				var childNode = el.childNodes[i];
				el.removeChild(childNode);
			}
		}
	}
}

function getText(el) {
	var text = "";
	if (el != null) {
		if (el.childNodes) {
			for (var i = 0; i < el.childNodes.length; i++) {
				var childNode = el.childNodes[i];
				if (childNode.nodeValue != null) {
					text = text + childNode.nodeValue;
				}
			}
		}
	}
	return text;
}